After all, language itself is abstract by its very nature, and has been utilised for ages and ages to create cryptic, abstract, or warped messages or thoughts. But as a cryptic statement that lacks clear meaning, it's pretty good. 'masturbation' would be a possible.
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'beating my vagina' is, as you say, a very strange collocation. Developmental biology of helicoforamina reveals holozoan affinity, cryptic diversity, and adaptation to heterogeneous environments in the early ediacaran weng’an biota (doushantuo. The leaves of Pittosporum esculentum are edible, and the Mistletoe spp. are spicy. Pittosporum spp. alseuosmia pusilla Pseudowintera colorata. Protective color (cryptic mimicry). Organisms that imitate their surrounding environment are called protective colors, generally for defense.
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For the same reason, negative is used. Affirmative is used in radio communications because of the ease with which a cryptic yes can be dropped or misunderstood.